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Bead Necklace-Shaped Single Walled Carbon Nanotube-Polypyrrole Nanocomposites for Ammonia Gas Sensor
Wen Xuan Du,변준호,강성민,Masaki Takada,김진열 한국고분자학회 2021 Macromolecular Research Vol.29 No.6
The nanocomposite of bead necklace-like structure in which single stands of single-walled carbon nanotube (SWCNT) are impregnated in several polypyrrole (PPy)/phenylalanine (PA), PPy@PA, nanoparticles, with an average bead diameter of 80 nm and SWCNT length of 5 μm, as a sensing material for detecting ammonia gas, was synthesized by simple emulsion polymerization. The synthesized nanocomposite showed an electrical conductivity more than 5 times higher than that of PPy alone with a selective reactivity to ammonia gas. In addition, it exhibited a high sensitivity of less than 100 ppb at room temperature and was not significantly affected by the sensitivity even under the humidity conditions of 0 ~70% RH (relative humidity).